The first derivative of a function $~g~$ is given by $\qquad g\,^\prime(x)=-3(x+0.2)\,$. It is clear that $~-0.2~$ is a critical number of $~g~$ because $~g\,^\prime(-0.2)=0\,$. The value $~g\,^{\prime\prime}(-0.2)~$ is [[☃ dropdown 1]], which makes $~g(-0.2)~$ [[☃ dropdown 2]].